Who is Maureen Grube from Revolutionary Road and what is their importance?

Maureen Grube is an attractive office worker at Knox Business Machines. She has a brief affair with Frank Wheeler , who is eight years her senior. Maureen behaves like a country bumpkin, and almost as soon as Farnk has slept with her, he asks himself why and feels guilty. He eventually breaks off their affair, all while berating himself over his infidelity.